iwlwifi: fix spinlock used before initialized

The patch fixes spinlock priv->lock (apm_ops.init) is used before it has
been initialized.

Signed-off-by: Ron Rindjunsky <ron.rindjunsky@intel.com>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>